PVC Heat Shrink Tubing — Electrical Insulation & Battery Pack Wrap (7mm–500mm, White/Black/Clear/Green)

The flat width listed (e.g., 27mm) is the lay-flat measurement before shrinking. The inner diameter (φ) shown in parentheses is the approximate recovered diameter after heat is applied. As a general rule, choose a flat width whose recovered φ value is slightly smaller than the object you want to cover — this ensures a snug, tight fit.

Example: To wrap a 14mm diameter wire bundle, a 17mm flat width (φ10.8mm recovered) is typically a close fit. When in doubt, size up one step — it's easier to work with a slightly looser tube than one that won't slide over your component. PVC tubing generally shrinks to roughly 50% of its original flat width.

This PVC heat shrink tubing generally has a 2:1 shrink ratio, meaning it shrinks to approximately 50% of its original flat width when heat is applied. This ratio is suitable for most wire bundling, battery pack wrapping, and cable insulation tasks. The φ value shown in each variant name reflects the approximate recovered inner diameter after full shrinkage.

PVC heat shrink tubing typically activates at temperatures between 70°C–120°C (158°F–248°F). A heat gun set to low or medium is the most reliable and consistent method. Move the heat gun slowly along the tubing to shrink evenly from one end to the other.

A hair dryer may work for smaller sizes but is generally less consistent. Avoid open flames — they can scorch or melt PVC unevenly and create weak spots in the insulation.

Yes — this is one of the most common uses for PVC heat shrink tubing in DIY battery pack builds.

• For standard 18650 cells (≈18.5mm diameter): the 29.5mm flat width (φ18.5mm) variant is typically the correct fit.
• For 21700 cells (≈21mm diameter): the 31mm flat width (φ20mm) is generally appropriate.

Always verify the exact outer diameter of your specific cell before ordering, as dimensions can vary slightly by manufacturer.

PVC heat shrink tubing provides good electrical insulation and basic moisture resistance, making it suitable for indoor and light-duty outdoor applications such as automotive wiring repairs or garden lighting connections. It is not rated for continuous submersion or prolonged direct UV exposure.

For demanding outdoor environments — such as marine wiring, underground conduit, or exposed exterior fixtures — a dual-wall adhesive-lined heat shrink tubing is generally recommended, as it provides a waterproof seal at the ends.

PVC heat shrink tubing is typically rated for low-voltage applications up to 600V AC. This covers the vast majority of residential wiring, automotive 12V/24V systems, and low-voltage DC battery packs.

For safety-critical circuits or applications requiring a certified voltage rating, please contact us to confirm specifications before use.

No — all four color variants share the same PVC material and insulation properties. Color choice is typically driven by:

• Black: Most common for general wiring; provides UV resistance and a clean, professional look.
• White: Useful where labels or markings need to be written directly on the tubing.
• Clear: Allows the underlying wire color, label, or component to remain visible after shrinking.
• Green: Commonly used for ground/earth wire identification per electrical color-coding conventions.